Device for heating or cooling workpieces and manufacturing method therefor

1 . A device for heating or cooing workpieces, comprising:

a shaft member having a shaft body and a flange portion which is molded integrally with the shaft body on an end portion of the shaft body and has a diameter greater than the diameter of the shaft body;

a plate member fixed to an end portion of the shaft member and having a recess in which the flange portion is housed;

a positioning portion which radially positions the flange portion with respect to the plate member;

a gap formed between a peripheral surface of the flange portion and an inner peripheral surface of the recess; and

a brazed portion which bonds an end face of the flange portion and the plate member together in the recess.

2 . A device for heating or cooling workpieces according to claim 1 , wherein the shaft member and the plate member are formed of a metal.

3 . A device for heating or cooling workpieces according to claim 2 , wherein the shaft member and the plate member are formed of aluminum or an aluminum alloy.

4 . A device for heating or cooling workpieces according to claim 1 , wherein the plate member is formed by lapping a plurality of plate elements in the thickness direction thereof and brazing the plate elements together, and the brazed portion between the plate elements extends parallel to the end face of the flange portion.

5 . A device for heating or cooling workpieces according to claim 1 , wherein a reverse surface of the flange portion and a reverse surface of the plate member are situated substantially flush with each other.

6 . A manufacturing method for a device for heating or cooing workpieces, the device having a shaft member and a plate member which is fixed to an end portion of the shaft member and formed of a plurality of plate elements lapped in the thickness direction thereof, comprising:

forming a flange portion having a diameter greater than the diameter of the shaft member on the end portion of the shaft member;

forming a recess for insertion of the flange portion in that one of the plate elements to which the flange portion is brazed, the depth of the recess being smaller than the thickness of the flange portion, the flange portion having a diameter such that a gap is formed between an inner peripheral surface of the recess and a peripheral surface of the flange portion when the flange portion is inserted in the recess;

locating a brazing material between the plate elements;

lapping the plate elements on one another;

locating a brazing material between an end face of the flange portion and the plate element to which the flange portion is brazed;

inserting the flange portion into the recess;

pressurizing a reverse surface of the flange portion in an axial direction of the shaft member by a pressurizing jig;

reducing the thickness of the flange portion by the pressurization so that the peripheral surface of the flange portion is allowed to extend by the gap;

pressurizing both the flange portion and the plate element in the axial direction with the pressurizing jig in contact with the reverse surface of the flange portion and a reverse surface of the plate element after the reverse surface of the flange portion is made flush with the reverse surface of the plate element by the pressurization;

heating the flange portion and the plate element to a temperature such that the brazing materials melt; and

brazing the flange portion and the plate element and brazing the plate elements together.